I think overall its good. It's an enormous improvement over the grotto they used to keep polar bears in. Additionally, it has two deep pools and the abundance of natural substrate is rare and welcomed for an animal typically confined to mock-rock. There are also several viewing windows, which is nice. On the other hand, the exhibit is much smaller than I expected it to be, and the pools (although deep) are not very large either. I would say its one of the better polar bear enclosures in existence, but not in the top tier by any standard.
